Lock.



R. BROHMANN.

LOGK.

APPLICATION FILED In as. 1910.

Patented Dec. 13, 1910.

RUDOLF BROHMANN, F HANOVER, GERMANY.

LOCK.

Specification of Letters Patent.

Patented Dec. 13, 1910.

Application filed May 28, 1910. Serial No. 563,917.

To all whom it may concern:

.jection 70,

Be it known that I, RUnoLr BROHMANN, a sub ect ofthe German Emperor, residing at Hanover, 1n Germany, have lnvented eertain new and useful Improvements in Locks,

of which the following is a specification.

This invention relates to looks having handles by rotation of which, into a certain position, the bolt and latch are positively locked.

One part of the invention consists in improved mechanism for efi'ecting this locking of the bolt and latch by means of the handle, so that they cannot be drawn, either by means of the key or by any lock-picking implement inserted from outside.

Another part of the invention consists in means for closing the handle-hole after removal of the handle when the bolt and latch have been locked by rotation of said handle.

A construction embodying these improvements is shown in the accompanying drawings, in which-- 7 Figures 1 and 2 are elevations of the lock with part of the casing removed to expose the mechanism; Fig. 1 shows the bolts shot and locked, and Fig. 2 shows the dead-bolt drawn and the latch bolt free for retraction. Fig. 3 is a plan-view, partly in section, showing the handle, part of the lock-case, and that part of the lock mechanism which the handle directly engages. Figs. l and are elevations of the device for closing the handle-hole, and Fig. 6 is a cross'section corresponding to Fig. 3, but with the handle removed and the handle hole closed.

In the drawings a represents the lock case, with key-hole a 7) the dead bolt, 0 the tumblers, and (Z the latch bolt. The lever 0 engaging the latch bolt and pivoted to the dead bolt has its lower arm so positioned that when the dead bolt is retracted, the lever can be actuated for drawing the latch bolt by turning the key. From inside the door, the latch-bolt is drawn by turning the handle f. The handle f is withdrawable from the bell-crank g which it engages; the arms h and 2' of this bell-crank are adapted to abut, at opposite sides, against the depending projection is of the latch bolt. The vertically movable slide Z is thrust by the spring at against the rear end of the arm h.

l/Vhen the dead bolt 6 is drawn, as shown in Fig. 2, the arm IL abuts against the proso that the latch bolt can be drawn by depressing the handle f. Upward rotation of the handle, from the horizontal position, is prevented by the slide Z, the member a of which abuts against the bolt 7).

lVhen the bolt Z) is shot into locking position, as shown in Fig. 1, it is removed from the path of the member a, and the handle f can be rotated upward from horizontal position, whereby the slide 1 is moved downward by the arm it so that the member it engages behind the bolt .7) and prevents the drawing of same. At the same time the member a of the slide Z is placed over the tumblers 0, so that the tumblers cannot be lifted. The arm 2' of the bell-crank abuts againstthe rear surface and the bolt Z) being shot the lower arm of the lever c is brought into contact with the abutment 0 fixed to the case.

The handle f is engaged with the bell crank g by means of projections q on its shank 7), said projections entering recesses r in the hub of the bell crank. The aperture in the shield. .9 through which the shank 9 passes is so shaped that in order to insert the shank, with the projections g thereon, the handle f must be held in vertical, upright position. In the horizontaloposition of the inserted handle f the projections Q prevent withdrawal of the handle from the lock case. When the handle f has been removed the slide wcan be moved in front of the handle-hole by means of a key o which moves the tumbler a. The aperture 10 in the tumbler Q) has at top and bottom enlargements forming notches m and a, and the projection 10 on the slide it engages the notch m when the slide is in its lower position, and the notch 0: when the slide has been lifted, by means of the key, to cover the handle-hole. W'hen rotated clockwise from the position shown in Fig. 5, the key v enters the notch a in the slide, pushes the tumbler 'v aside, against the action of spring 3 lifts the slide, and then allows the tumbler to swing to the right, so that the notch 00 engages the projection 10 By rotation of the key '0 in the opposite direction these operations are reversed. In both its end positions the slide a is locked by engagement with the tumbler o.

What I claim as my invention and desire to secure by Letters Patent of the United States is 1. In a lock the combination of a dead bolt, a latch belt, a hand operated lever acting on the latch bolt, a locking member of the projection 70, g

movable into the path of the dead bolt when shot, means integral with said lever for moving said locking member and means for yieldingly holding said lever when the locking member has been moved as aforesaid.

2. In a lock the combination of a dead bolt a latch bolt, a hand operated lever acting on the latch bolt, a locking member movable into the path of the dead bolt when shot, means integral with said lever for moving said locking member, a lever pivoted to said dead bolt and engaging the latch bolt, and an abutment for said last mentioned lever when the dead bolt is shot.

3. In a lock the combination of a dead bolt, a latch bolt, a hand operated lever acting on the latch bolt, a locking member movable into the path of the dead bolt when shot, means integral with said lever for moving said locking member, a detachable handle for said lever, and a shield permitting removal and insertion of the handle only when the lever is in the position in which the locking member engages the dead bolt.

l. Ina lock the combination of a dead bolt, a latch bolt a hand operated lever acting on the latch bolt, a locking member movable into the path of the dead bolt when shot, means integral with said'lever for moving said locking member, and means whereby the dead bolt when drawn prevents movement of said locking member.

In witness whereof I have signed this specification in the presence of two witnesses.

RUDOLF BROHMANN.

\Vitnesses R. v. Bt'mow, M. L. THOMPSON. 

